From d224c7879ae71979e8b9675b38e9a16310560dc3 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Thu, 17 Nov 2011 00:21:52 +0000
Subject: [PATCH] Turn on vzeroupper insertion on call boundaries for AVX; it
 works as far as I know, and I'd like to see wider testing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144867 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86TargetMachine.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp
index 37aa68106c7..1c9f3bd5498 100644
--- a/lib/Target/X86/X86TargetMachine.cpp
+++ b/lib/Target/X86/X86TargetMachine.cpp
@@ -105,7 +105,7 @@ X86TargetMachine::X86TargetMachine(const Target &T, StringRef TT,
 static cl::opt<bool>
 UseVZeroUpper("x86-use-vzeroupper",
   cl::desc("Minimize AVX to SSE transition penalty"),
-  cl::init(false));
+  cl::init(true));
 
 //===----------------------------------------------------------------------===//
 // Pass Pipeline Configuration
-- 
2.34.1